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Location: 13 km SW from Huamachuco, Peru
Ave. La Floresta 497 Of. 101 Charcarilla del EstanqueSan Borja, Lima 41LimaPeru15037
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Two types of mineralized deposits are recognized at the La Arena property – high sulfidation epithermal gold deposits (La Arena mine) and porphyry-hosted copper-gold deposits (La Arena II project).In porphyry deposits, the sulfide ore minerals are dominantly structurally-controlled, with most mineralization occurring as close-spaced and cross-cutting vein stockwork, vein arrays, fractures, breccias and disseminations. In the hypogene portions of copper porphyry deposits, the copper occurs predominantly as chalcopyrite; other important copper ore minerals may include bornite and enargite. Supergene copper mineralization is generally dominated by chalcocite and lesser covellite. Porphyry-hosted Copper-Gold MineralizationCopper-gold mineralization is associated with phyllic (quartz-sericite) and potassic (secondary biotite + magnetite + potassium feldspar) alterations, which is dominated principally by pyrite and chalcopyrite with lesser amounts of bornite, covellite, chalcocite and molybdenite. Mineral zoning from surface downwards below the oxidized cap is typically about 40 to 50 meters for the zone of secondary enrichment (chalcocite + covellite ± copper oxides) and ten to 40 meters for the mixed oxide-sulfide transitional zone (chalcocite + chalcopyrite ± covellite). The top of the primary sulfide mineralized zone (chalcopyrite ± bornite) which predominates at La Arena is typically located at depths in excess of 100 meters from the surface. The copper-gold porphyry at La Arena II comprises an elongated mineralized body approximately 1,400 meters in length (oriented northwest-southeast) and 200 to 400 meters wide. Mineralization occurs as disseminations along hairline fractures as well as within larger veins. Mineralization has been identified by drilling to depths of 1,000 meters below the surface which shows the porphyry to be narrowing, but with no decrease in copper and gold grades.Sulfide mineralization consists of pyrite, chalcopyrite and molybdenite, with accessory pyrrhotite, sphalerite, galena, arsenopyrite, marcasite and rutile. Very fine (~25 microns) particles of native gold have been observed. The FPA-2 intrusion has the most abundant copper and gold mineralization that is associated with phyllic (quartz-sericite) and potassic (secondary biotite, magnetite, K feldspar) alteration with copper grades ranging from nil to locally greater than one percent; gold grades range from nil to locally greater than one gram per tonne. Lower grade copper gold mineralization is related to the intra mineral FPA-3 intrusion, which locally contains copper grades up to 0.5 percent and gold grades up to 0.5 grams per tonne.
